From: Ingo Molnar <mingo@elte.hu>
Date: Sat, 3 Sep 2005 22:56:26 +0000 (-0700)
Subject: [PATCH] x86: compress the stack layout of do_page_fault()
X-Git-Tag: v2.6.14-rc1~867
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=869f96a00e8f53c7db8470ca9cf72e2e3fa40119;p=pandora-kernel.git

[PATCH] x86: compress the stack layout of do_page_fault()

This patch pushes the creation of a rare signal frame (SIGBUS or SIGSEGV)
into a separate function, thus saving stackspace in the main
do_page_fault() stackframe.  The effect is 132 bytes less of stack used by
the typical do_page_fault() invocation - resulting in a denser
cache-layout.

(Another minor effect is that in case of kernel crashes that come from a
pagefault, we add less space to the already existing frame, giving the
crash functions a slightly higher chance to do their stuff without
overflowing the stack.)

(The changes also result in slightly cleaner code.)

argument bugfix from "Guillaume C." <guichaz@gmail.com>

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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